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ISP & Telecom Directory · United States

X1 Mobile LLC

X1 Mobile LLC is a Cellular/PCS/SMR in United States, listed in the FCC register. The contact details below are reproduced from that register as of August 2026; verify against the live register before serving legal process.

X1 Mobile LLC

Cellular/PCS/SMR

Also known as: X1 Mobile

Agent for service of process
Mark DENBO, Smithwick & Belendiuk P.C., 5028 WISCONSIN AVE, SUITE 301, Washington, DC, 20016
Agent phone / fax
(202) 350-9656
Headquarters
500 SUMMER ST, STE 405, Stamford, CT, 06901
Customer inquiries
(860) 516-9000
Holding company
States served (2)
Connecticut, New York
FCC 499 Filer ID
837159
Last filing
4/1/2026

Sending a lawful request to X1 Mobile LLC

Serve subpoenas, court orders and preservation letters on the agent for service of process named below; registered-agent firms forward to the company's legal team. Requests from outside the United States go through the MLAT or CLOUD Act route. For the procedure and legal basis in United States, see the investigator guides; for platform and app data requests, the LERS portal guides.

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Source: FCC Form 499 Filer Database. Independent reference for study and investigative use; Ministry of Cyber Affairs is not a government body and does not represent X1 Mobile LLC. Names and contact details are reproduced as published by the regulator.